螺纹钢性能测试视频引伸计研究  

Research on video extensometer for rebar performance test

作　　者：江润 钟昊 王雪梅[1] 倪文波[1] Jiang Run;Zhong Hao;Wang Xuemei;Ni Wenbo(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学机械工程学院,成都610031

出　　处：《电子测量技术》2023年第12期111-117,共7页Electronic Measurement Technology

摘　　要：针对目前视频引伸计在实际应用中存在的做标记困难、标记在试验中容易发生脱落的问题,面向螺纹钢性能测试,研究了一套无需特殊人工标记,基于螺纹钢自身的纹理特征就可实现高精度位移跟踪测量的视频引伸计系统。介绍了视频引伸计测量系统的硬件组成、选型和基本工作原理。主要对所采用的图像匹配算法进行了研究,分析讨论了匹配模板位置和大小的选取、基于曲面拟合的亚像素定位算法以及动态测试中匹配模板的更新等问题。最后通过静态试验、刚性位移试验和动态试验验证了该视频引伸计系统能够保证测量的实时性和准确性。In view of the current problems that the video extensometer is difficult to mark in practical applications and the mark is easy to fall off in the test,a set of video extensometer system that can realize high-precision displacement tracking measurement based on the texture characteristics of the rebar itself without special manual marks was designed for the performance test of rebar.The hardware composition,selection and basic working principle of the video extensometer measurement system were introduced.The image matching algorithm used was mainly studied,and the selection of the position and size of the matching template,the sub-pixel positioning algorithm based on surface fitting,and the update of the matching template in dynamic test were analyzed and discussed.Finally,static test,rigid displacement test and dynamic test all verify that the designed video extensometer system can meet the real-time and accuracy requirements of the measurements.

关 键 词：视频引伸计 螺纹钢 图像匹配 拉伸试验 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]